U.S. patent number 6,819,855 [Application Number 10/344,304] was granted by the patent office on 2004-11-16 for clip removing tool and clip removing method.
This patent grant is currently assigned to Fujikura Ltd.. Invention is credited to Kunihiko Fujiwara, Yukio Hayashi, Yoshikazu Nomura, Yasuhiro Tamaki.
United States Patent |
6,819,855 |
Fujiwara , et al. |
November 16, 2004 |
**Please see images for:
( Certificate of Correction ) ** |
Clip removing tool and clip removing method
Abstract
The present invention is applied to a structure in which to
attach a backplane connector to a backplane so that the backplane
connector can be moved by a desired amount, a clip from which a
pair of elastic pawls project is used to engage the backplane with
the backplane connector through holes in the backplane. The present
invention allows the clip of this structure to be removed
efficiently. That is, the present invention provides a clip
removing tool 50 comprising disengaging pieces 52a and 52b that
push in a pair of elastic pawls 29b through an attaching slot 31 in
a backplane 23, the elastic pawls 29b being engaged with locking
portions 34 on opposite side portions of a BH housing 26 are
pushed, to disengage the elastic pawls 29b from the locking
portions 34, as well as a clip removing method using this clip
removing tool.
Inventors: |
Fujiwara; Kunihiko (Sakura,
JP), Hayashi; Yukio (Sakura, JP), Tamaki;
Yasuhiro (Sakura, JP), Nomura; Yoshikazu (Sakura,
JP) |
Assignee: |
Fujikura Ltd. (Tokyo,
JP)
|
Family
ID: |
26597521 |
Appl.
No.: |
10/344,304 |
Filed: |
July 29, 2003 |
PCT
Filed: |
August 07, 2001 |
PCT No.: |
PCT/JP01/06769 |
PCT
Pub. No.: |
WO02/12939 |
PCT
Pub. Date: |
February 14, 2002 |
Foreign Application Priority Data
|
|
|
|
|
Aug 7, 2000 [JP] |
|
|
2000-239216 |
|
Current U.S.
Class: |
385/134;
385/53 |
Current CPC
Class: |
G02B
6/3893 (20130101); G02B 6/43 (20130101); G02B
6/3897 (20130101); G02B 6/385 (20130101); G02B
6/3898 (20130101) |
Current International
Class: |
G02B
6/38 (20060101); G02B 6/43 (20060101); G02B
006/00 () |
Field of
Search: |
;385/53,72,88,134-137 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
61-89809 |
|
Jun 1986 |
|
JP |
|
63-84103 |
|
Jun 1988 |
|
JP |
|
07-020355 |
|
Jan 1995 |
|
JP |
|
07-326460 |
|
Dec 1995 |
|
JP |
|
2000-206370 |
|
Jul 2000 |
|
JP |
|
99/21040 |
|
Apr 1999 |
|
WO |
|
Primary Examiner: Palmer; Phan T. H.
Attorney, Agent or Firm: Darby & Darby
Claims
What is claimed is:
1. A clip removing tool used to disengage an optical connector from
a clip used to attach said optical connector to a backplane, the
clip removing tool being characterized by comprising a removing
tool main body advanced toward or retreated from said optical
connector and disengaging pieces projecting from the removing tool
main body, and in that said disengaging pieces are pushed against
engaging pawls projecting from side portions of elastic pawl
leading end portions of said clip, to deform said engaging pawls to
reduce the amount of parts of the engaging pawls which project from
said elastic pawl leading end portions, thus disengaging said
engaging pawls from said optical connector.
2. The clip removing tool according to claim 1, characterized in
that said disengaging pieces are pushed against the engaging pawls
projecting from the side portions of the elastic pawl leading end
portions of said clip to deform said engaging pawls, thus reducing
the amount of parts of said engaging pawls which project from said
elastic pawl leading end portions.
3. The clip removing tool according to claim 1, characterized in
that said disengaging pieces are rotatably supported on the
removing tool main body, and each comprise, at its leading end in a
direction in which the disengaging piece projects from said
removing tool main body, an engaging pawl pushing portion that
pushes said corresponding engaging pawl to reduce the amount of
part of said engaging pawl which projects from said elastic pawl
leading end portion, thus disengaging the engaging pawl from a
locking portion provided in said optical connector, and an abutting
portion that pushes said corresponding elastic pawl as the removing
tool main body advances toward the optical connector.
4. The clip removing tool according to claim 2, characterized in
that said disengaging pieces are rotatably supported on the
removing tool main body, and each comprise, at its leading end in a
direction in which the disengaging piece projects from said
removing tool main body, an engaging pawl pushing portion that
pushes said corresponding engaging pawl to reduce the amount of
part of said engaging pawl which projects from said elastic pawl
leading end portion, thus disengaging the engaging pawl from a
locking portion provided in said optical connector, and an abutting
portion that pushes said corresponding elastic pawl as the removing
tool main body advances toward the optical connector.
5. The clip removing tool according to claim 1, characterized in
that said removing tool main body is provided with an attachment
used to separately attach an operation handle for an operation of
advancement toward or retreat from said optical connector.
6. The clip removing tool according to claim 2, characterized in
that said removing tool main body is provided with an attachment
used to separately attach an operation handle for an operation of
advancement toward or retreat from said optical connector.
7. The clip removing tool according to claim 3, characterized in
that said removing tool main body is provided with an attachment
used to separately attach an operation handle for an operation of
advancement toward or retreat from said optical connector.
8. The clip removing tool according to claim 4, characterized in
that said removing tool main body is provided with an attachment
used to separately attach an operation handle for an operation of
advancement toward or retreat from said optical connector.
9. The clip removing tool according to any of claims 1 to 8,
characterized in that said removing tool main body is provided with
a holding engaging portion that engages with the optical
connector.
10. A clip removing method of disengaging an optical connector from
a clip used to attach said optical connector to a backplane, the
method being characterized by comprising pushing a holding tool to
said backplane to disengage said clip from said optical
connector.
11. The clip removing method according to claim 10, characterized
by further comprising disengaging elastic pawls of said clip from
said optical connector held using said holding tool and then
removing said optical connector from a neighborhood of said
backplane together with said holding tool.
12. The clip removing method according to claim 11, characterized
in that said elastic pawls are disengaged from said optical
connector by pushing engaging pawls projecting from side portions
of elastic pawl leading end portions of said clip to reduce the
amount of parts of said engaging pawls which project from said
elastic pawl leading end portions, and with this state maintained,
pushing said elastic pawl leading end portions to move said elastic
pawls to positions where said engaging pawls do not engage with the
optical connector.
Description
TECHNICAL FIELD
The present invention relates to a clip removing tool and method
used to remove a clip used to attach an optical connector to a
backplane.
BACKGROUND ART
Backplane connectors have hitherto been provided as optical
connectors of a plug-in type.
FIG. 36 shows an example of a backplane connector. In FIG. 36,
reference numeral 1 denotes a plug-in unit, reference numeral 2
denotes a printed board, and reference numeral 3 denotes a
backplane. Reference numerals 4a and 4b denote MPO connector plugs
(hereinafter referred to as "MPO plugs"), reference numeral 5
denotes a printed board housing (hereinafter referred to as a "PH
housing"), and reference numeral 6 denotes a backplane housing
(hereinafter referred to as a "BH housing").
With this backplane connector, by inserting the printed board 2 to
which the PH housing 5 is fixed into the plug-in unit 1, the PH
housing 5 is fitted into the BH housing 6 attached to the backplane
3 arranged on a side portion of the plug-in unit 1. The PH housing
5 and the BH housing 6 fitted into each other constitute an optical
connector adapter 7. The optical connector adapter 7 allows the
connection of the MPO plugs 4a and 4b inserted into the optical
connector adapter 7 from its opposite sides. The MPO plug 4a
inserted into the optical connector adapter 7 from the PH housing 5
side is inserted into the PH housing 5 beforehand. It is then
inserted into the optical connector adapter 7 at the same time when
the printed board 2 is inserted into the plug-in unit 1. A
plurality of printed boards 2 can be densely accommodated in
parallel in the plug-in unit 1. Consequently, this backplane
connector allows optical connector adapters 7 to be densely
mounted.
The MPO plugs 4a and 4b are optical connectors comprising an
optical connector ferrule 4c specified in Japanese Industrial
Standard JIS C 5981 and supported in a plastic housing.
FIG. 37 is an exploded perspective view showing a structure in
which the BH housing 6 is mounted on the backplane 3. As shown in
FIG. 37, the BH housing 6 is mounted on the backplane 3 so as to
sandwich the backplane 3 between the BH housing 6 and a rear
surface housing 9 arranged opposite the BH housing 6 via the
backplane 3. That is, pins 10 projecting from the BH housing 6
arranged at the printed board 2 side (the left of FIG. 37) of the
backplane 3 are inserted into an attaching slot 11 so as to project
from the opposite side of the backplane 3. The rear surface housing
9 is fixed to the projecting ends of the pins 10 using screws 12.
Thus, the backplane 3 is sandwiched between the BH housing 6 and
the rear surface housing 9. A slot is formed in a housing main body
8 of the BH housing 6 and in the rear housing 9 so that the optical
connector plug 4b (MPO plug) is inserted into these slots via the
attaching slot 11 in the backplane 3. However, these slots are
omitted from FIG. 37.
The BH housing 6 is mounted on the backplane 3 so as to be movable
a small distance. For example, in FIG. 37, extended portions 13
formed by extending four corners of the rectangular attaching slot
11 allow the screws 12, connecting the BH housing 6 and the rear
surface housing 9 together, to move a small distance. This movable
range of the screws 12 allows the BH housing 6 to move a small
distance. The movement of the BH housing 6 absorbs dimensional
tolerances to the BH housing 6 and PH housing 5 to contribute to
smooth fitting operations.
However, with the backplane connector, the small size (about 1.2 mm
in diameter) of the screws 12 results in the need of much time and
labor to fix the rear surface housing 9 using a hand tool.
Furthermore, it takes much time and labor to form the pins 10,
threaded holes 16 (see FIG. 37), and attaching slot 11
corresponding to the screws 12.
Furthermore, the movement range of the backplane housing 6 depends
on the sliding resistance of the housing main body 8 and rear
surface housing 9 to the backplane 3, the magnitude of the
clearance between the housing main body 8 or rear surface housing 9
and the backplane 3, or the like. A small variation in the size of
the clearance significantly affects the movement range or degree of
freedom of the backplane housing 6. Accordingly, it takes much time
and labor to adjust the clearance. That is, if a useless gap is
created between the housing main body 8 and the rear surface
housing 9 because of the tolerances to the backplane 3, notably the
tolerance to its thickness dimension, then the movement range of
the backplane housing 6 is unnecessarily widened. This makes it
difficult to fit the printed board housing 5. In contrast, if the
backplane 3 has a thickness larger than a predetermined one, it may
be difficult to move the backplane housing 6 or fix the backplane
housing 6 using the screws 12.
Thus, with the backplane connector of the conventional
configuration, it takes much time and labor to ensure the desired
movement range of the backplane housing 6. On the other hand, when
the entire backplane 3 is formed precisely in view of these
problems, costs increase sharply.
To solve these problems, the inventor has developed a backplane
connector comprising a clip from which elastic pawls project and
which is arranged opposite a backplane housing via a backplane so
that the elastic pawls allowed to penetrate an attaching slot
formed in the backplane engages with the backplane. Accordingly,
the backplane housing is mounted on the backplane so that the
backplane is sandwiched between the backplane connector and the
clip. With this backplane connector, the movement range of the
backplane housing can be set on the basis of the movable range of
the elastic pawls in the attaching slot formed in the backplane.
Consequently, compared to the conventional structure using screws,
the movement range of the backplane housing can be set easily.
Furthermore, ensuring the accuracy of formation of the elastic
pawls reduces the need for the accuracy of formation required for
the backplane housing and the parts of the clip other than the
elastic pawls. Therefore, costs can be reduced.
However, this backplane connector requires development of a
technique of easily disengaging the elastic pawls of the clip from
the backplane housing when replacement of the clip or the like is
carried out for replacement of the backplane housing, a change in
movement range, or the like. That is, the backplane connector must
have a reduced size in order to improve mounting density.
Accordingly, it is desirable to reduce the elastic pawls or locking
portions of the backplane housing on which the corresponding
elastic pawls are locked. However, a reduction in the size of the
locking portions and elastic pawls may make it difficult to
disengage the elastic pawls from the locking portions. Conversely,
when the size of the elastic pawls is increased in order to
facilitate the disengagement, it is difficult to increase the
mounting density. Furthermore, for example, the backplane housing
mounted on the backplane of the plug-in unit is located at the
innermost position of the plug-in unit. Thus, it is very difficult
to disengage the elastic pawls of the clip from the backplane
housing.
The present invention is provided in view of these problems. It is
an object of the present invention to provide a clip removing tool
and method that allows a clip to be disengaged easily from a
backplane housing.
DISCLOSURE OF THE INVENTION
A first aspect of the present invention is a clip removing tool
used to disengage an optical connector from a clip used to attach
the optical connector to a backplane, the clip removing tool being
characterized by comprising a removing tool main body advanced
toward or retreated from the optical connector and disengaging
pieces projecting from the removing tool main body, and in that the
disengaging pieces are pushed against engaging pawls projecting
from side portions of elastic pawl leading end portions of the
clip, to deform the engaging pawls to reduce the amount of parts of
the engaging pawls which project from the elastic pawl leading end
portions, thus disengaging the engaging pawls from the optical
connector.
In this case, the disengaging pieces are pushed against, for
example, the engaging pawls projecting from the side portions of
the elastic pawl leading end portions of the clip to deform the
engaging pawls, thus reducing the amount of parts of the engaging
pawls which project from the elastic pawl leading end portions.
Furthermore, the disengaging pieces of the clip removing tool may
be rotatably supported on the removing tool main body, and may each
comprise, at its leading end in a direction in which the
disengaging piece projects from the removing tool main body, an
engaging pawl pushing portion that pushes the corresponding
engaging pawl to reduce the amount of part of the engaging pawl
which projects from the elastic pawl leading end portion, thus
disengaging the engaging pawl from a locking portion provided in
the optical connector, and an abutting portion that pushes the
corresponding elastic pawl as the removing tool main body advances
toward the optical connector.
Alternatively, the removing tool main body may be provided with an
attachment used to separately attach an operation handle for an
operation of advancement toward or retreat from the optical
connector.
Furthermore, the removing tool main body may be provided with a
holding engaging portion that engages with the optical
connector.
A second aspect of the present invention is a clip removing method
of disengaging an optical connector from a clip used to attach the
optical connector to a backplane, the method being characterized by
comprising pushing a holding tool against the backplane to
disengage the clip from the optical connector.
In this case, elastic pawls are disengaged from the optical
connector by, for example, disengaging the elastic pawls of the
clip from the optical connector held using the holding tool and
then removing the optical connector from a neighborhood of the
backplane together with the holding tool. More specifically, for
example, engaging pawls projecting from side portions of elastic
pawl leading end portions of the clip are pushed to reduce the
amount of parts of the engaging pawls which project from the
elastic pawl leading end portions. Then, with this state
maintained, the elastic pawl leading end portions are pushed to
move the elastic pawls to positions where the engaging pawls do not
engage with the optical connector.
In the first and second aspects of the present invention, the
"optical connector" attached to the backplane may have any
configuration and may be, for example, the backplane housing of the
backplane connector.
Furthermore, the holding tool used in the second aspect of the
present invention may be the above described clip removing tool
comprising a holding engaging portion or an exclusive holding tool
which is separate from the clip removing tool and which is used to
hold the optical connector by engagement, fitting, gripping, or the
like. However, a holding tool also used as a clip removing tool is
more advantageous in that it enables the elastic pawls of the clip
to be disengaged from the optical connector while simultaneously
holding the optical connector, in that it allows the optical
connector to be removed easily (operability), in that it serves to
reduce costs, and the like.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view showing an example of a
backplane connector to which a clip removing tool according to the
present invention is applied;
FIG. 2 is a side sectional view showing the back plane connector in
FIG. 1;
FIG. 3 is a diagram showing the neighborhood of an attaching slot
into which elastic pawls of a clip used to attach a BH housing of
the backplane connector in FIG. 1 to a backplane are inserted, and
also showing the movable range of the elastic pawls in the
attaching slot;
FIG. 4 is a side sectional view showing how the BH housing of the
backplane connector in FIG. 1 are engaged with the clip;
FIG. 5 is a perspective view showing a clip removing tool applied
to the BH housing of the backplane connector in FIG. 1 and the
clip;
FIG. 6A is a partial side sectional view showing the clip removing
tool in FIG. 5;
FIG. 6B is a side view showing the clip removing tool in FIG. 5 as
viewed from its front (left side of FIG. 6A) in a direction in
which it is pushed against the BH housing;
FIG. 6C is a top view showing the clip removing tool in FIG. 5;
FIG. 6D is a bottom view showing the clip removing tool in FIG.
5;
FIG. 7A is a partial side sectional view showing a removing tool
main body constituting the clip removing tool in FIG. 5;
FIG. 7B is a plan view showing the removing tool main body
constituting the clip removing tool in FIG. 5;
FIG. 7C is a side view showing the removing tool main body
constituting the clip removing tool in FIG. 5, as viewed from its
front;
FIG. 7D is a side view showing the removing tool main body
constituting the clip removing tool in FIG. 5, as viewed from its
rear;
FIG. 8A is a plan view showing a frame of a pawl block constituting
the clip removing tool in FIG. 5;
FIG. 8B is a sectional view showing the frame of the pawl block
constituting the clip removing tool in FIG. 5;
FIG. 8C is a sectional view showing the frame of the pawl block
constituting the clip removing tool in FIG. 5, as viewed from its
side attached to the removing tool main body;
FIG. 8D is a side view showing the frame of the pawl block
constituting the clip removing tool in FIG. 5, as viewed from its
front;
FIG. 9A is a plan view showing a disengaging piece attached to the
frame in FIG. 8;
FIG. 9B is a side view showing the disengaging piece attached to
the frame in FIG. 8;
FIG. 10A is a horizontal sectional view showing the configuration
of a holding engaging portion provided in the clip removing tool in
FIG. 5;
FIG. 10B is a side view showing the holding engaging portion
provided in the clip removing tool in FIG. 5 as viewed from its
leading end portion;
FIG. 10C is a side view showing the holding engaging portion
provided in the clip removing tool in FIG. 5 as viewed from its
side on which a window in an inserting cap is formed;
FIG. 10D a side view showing the holding engaging portion provided
in the clip removing tool in FIG. 5 as viewed from its side
opposite to the side shown in FIG. 10C;
FIG. 11A is a plan view showing a state observed before the clip
removing tool is pushed against the BH housing;
FIG. 11B is a partial side sectional view showing the state
observed before the clip removing tool is pushed against the BH
housing;
FIG. 12A is a plan view showing an example in which an operation
lever is applied as an operation handle;
FIG. 12B is a partial side sectional view showing the example in
which the operation lever is applied as an operation handle;
FIG. 13A is a plan view showing that the clip removing tool has
been pushed against the BH housing;
FIG. 13B is a partial side sectional view showing that the clip
removing tool has been pushed against the BH housing;
FIG. 14 is a diagram showing a disengaging piece of the clip
removing tool in FIG. 5;
FIG. 15 is a diagram showing the disengaging piece of the clip
removing tool in FIG. 5 and also showing that an abutting portion
is pushed against an engaging pawl of the clip to push it down;
FIG. 16 is a diagram showing the disengaging piece of the clip
removing tool in FIG. 5 and also showing that the abutting portion
is abutted against an elastic pawl leading end portion of the
clip;
FIG. 17 is a diagram showing that a rising-and-sinking engaging
piece of the holding engaging portion inserted into a plug hole in
an internal housing of the BH housing is located in the plug
hole;
FIG. 18A is a horizontal sectional view showing that the
rising-and-sinking engaging piece of the holding engaging portion
inserted into the plug hole in the internal housing of the BH
housing has slipped out of the plug hole toward the backplane and
then engaged with the internal housing;
FIG. 18B is a side view showing that the rising-and-sinking
engaging piece of the holding engaging portion inserted into a plug
hole in an internal housing of the BH housing has slipped out of
the plug hole toward the backplane and then engaged with the
internal housing, as viewed from the leading end of the holding
engaging portion;
FIG. 19A is a plan view showing that the BH housing, from which the
clip was removed using the clip removing tool in FIG. 5, has been
taken out from a plug-in unit together with the clip removing
tool;
FIG. 19B is a partial side sectional view showing that the BH
housing, from which the clip was removed using the clip removing
tool in FIG. 5, has been taken out from a plug-in unit together
with the clip removing tool;
FIG. 20 is a horizontal sectional view showing that after the state
shown in FIG. 18, the inserting cap of the holding engaging portion
has been pushed into a proximal end of the holding engaging portion
to disengage the rising-and-sinking engaging piece from the
internal housing;
FIG. 21 is an exploded perspective view showing a specific example
of the BH housing of the backplane connector in FIG. 1;
FIG. 22 is a perspective view showing how the BH housing in FIG. 21
is assembled;
FIG. 23A is a horizontal sectional view showing the internal
housing of the BH housing in FIG. 21 and also showing how
components are housed in the housing main body;
FIG. 23B is a side view showing the internal housing of the BH
housing in FIG. 21 and also showing how connector holding pawls
engage with an optical connector plug;
FIG. 23C is a side view showing the internal housing of the BH
housing in FIG. 21 and also showing how the holding engaging
portion of the clip removing tool in FIG. 6 engages with the
connector holding pawls;
FIG. 24 is an exploded perspective view showing an example of a
multi-backplane-connector;
FIG. 25 is a perspective view showing a clip removing tool applied
to the BH housing and clip of the backplane connector in FIG.
24;
FIG. 26A is a partial side sectional view showing the clip removing
tool in FIG. 25;
FIG. 26B is a side view showing the clip removing tool in FIG. 25
and also showing that one of the holding engaging portions has been
removed as viewed from the front of the clip removing tool in a
direction in which the clip removing tool is pushed against the BH
housing (the left of FIG. 26A);
FIG. 26C is a plan view showing the clip removing tool in FIG.
25;
FIG. 26D is a bottom view showing the clip removing tool in FIG.
25;
FIG. 27A is a partial side sectional view showing a removing tool
main body of the clip removing tool in FIG. 25;
FIG. 27B is a plan view showing the removing tool main body of the
clip removing tool in FIG. 25;
FIG. 27C is a side view showing the removing tool main body of the
clip removing tool in FIG. 25 as viewed from its front;
FIG. 27D is a side view showing the removing tool main body of the
clip removing tool in FIG. 25 as viewed from its rear;
FIG. 28A is a plan view showing a state observed before the clip
removing tool in FIG. 25 is pushed against the BH housing;
FIG. 28B is a partial side sectional view showing the state
observed before the clip removing tool in FIG. 25 is pushed against
the BH housing;
FIG. 29A is a plan view showing that the clip removing tool in FIG.
25 has been pushed against the BH housing;
FIG. 29B is a partial side sectional view showing that the clip
removing tool in FIG. 25 has been pushed against the BH
housing;
FIG. 30A is a plan view showing that the BH housing, from which the
clip was removed using the clip removing tool in FIG. 25, has been
taken out from the plug-in unit together with the clip removing
tool;
FIG. 30B is a partial side sectional view showing that the BH
housing, from which the clip was removed using the clip removing
tool in FIG. 25, has been taken out from the plug-in unit together
with the clip removing tool;
FIG. 31A is a plan view showing that the inserting cap of the
holding engaging portion of the clip removing cap in FIG. 30 has
been pushed into a proximal end of the holding engaging portion to
disengage the rising-and-sinking engaging piece from the internal
housing;
FIG. 31B is a partial side sectional view showing that the
inserting cap of the holding engaging portion of the clip removing
cap in FIG. 30 has been pushed into the proximal end of the holding
engaging portion to disengage the rising-and-sinking engaging piece
from the internal housing;
FIG. 32A is a plan view showing that the BH housing has been
separated from the clip removing tool in FIG. 30;
FIG. 32B is a partial side sectional view showing that the BH
housing has been separated from the clip removing tool in FIG.
30;
FIG. 33 is a perspective view showing a clip removing method using
the clip removing tool in FIG. 25 and also showing a state before
the clip removing tool is pushed against the BH housing;
FIG. 34 is a perspective view showing the clip removing method
using the clip removing tool in FIG. 25 and also showing that the
clip removing tool has been pushed against the BH housing;
FIG. 35 is a perspective view showing the clip removing method
using the clip removing tool in FIG. 25 and also showing that the
BH housing, disengaged from the clip using the clip removing tool,
has been drawn out from the plug-in unit integrally with the clip
removing tool;
FIG. 36 is an exploded perspective view showing an example of a
conventional backplane connector; and
FIG. 37 is an exploded perspective view showing a structure in
which a BH housing and a rear surface housing are fixed together in
the backplane connector in FIG. 36.
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with
reference to the drawings.
First, description will be given of a backplane connector
(hereinafter referred to as a "BP connector") to which a clip
removing tool according to the present invention is applied.
FIG. 1 is an exploded perspective view showing an example of a BP
connector. FIG. 2 is a side sectional view. In FIGS. 1 and 2,
reference numeral 20 denotes a BP connector, reference numeral 21
denotes a plug-in unit, and reference numeral 22 denotes a printed
board. Reference numeral 23 denotes a backplane, reference numerals
24a and 24b denote optical connector plugs, and reference numeral
25 denotes a printed board housing (hereinafter referred to as a
"PH housing"). Reference numeral 26 denotes an optical connector
attached to the backplane 23, in this case, a backplane housing
(hereinafter sometimes referred to as a "BH housing"). The
"backplane housing" or "BH housing" will be sometimes referred to
as an "optical connector".
With the BP connector 20 illustrated in FIGS. 1 and 2, the printed
board 22 to which the PH housing 25 is fixed is inserted into the
plug-in unit 2, and the PH housing 25 is fitted into the BH housing
26 attached to the backplane 23 of the plug-in unit 21. Then, the
PH housing 25 and the optical connector plugs 24a and 24b, already
inserted into the BH housing 26 for engagement and retention, are
connected together. The PH housing 25 and BH housing 26, which have
been fitted together, constitute an optical connector adapter 27
used to connect together the optical connector plugs 24a and 24b
inserted from the opposite sides of the BP connector.
The optical connector plugs 24a and 24b used in this case are, for
example, optical connector plugs (hereinafter sometimes referred to
as "MPO plugs") for so-called MPO (Mlutifiber Push On) type optical
connectors specified in Japanese Industrial Standards JIS C 5982
and International Electrotechnical Commission IEC 1754-7. That is,
these optical connector plugs 24a and 24b are optical connectors
each comprising an optical connector ferrule 24c which is an MT
(Mechanically Transferable) type optical connector specified in the
JIS C 5981 and which is supported in a plastic housing. The optical
connector ferrule 24c generally has its tips were PC (Physical
Contact) polished.
Specifically, the optical connector ferrules 24c and 24c specified
in the JIS C 5981 are abutted and connected together by inserting
and fitting a guide pin 24p already fitted into one of the optical
connector ferrules 24c so as to project from its junction end
surface, into a guide pin hole 24o drilled in the other optical
connector ferrule 24c, to achieve accurate positioning. By slightly
moving the BH housing 26, the PH housing 25 is fitted precisely,
enabling the guide pin 24p to be inserted and fitted smoothly into
the guide pin hole. This allows the optical connector ferrules 24c
to be connected together more easily.
The optical connector plugs 24a and 24b are not limited to the
previously described MPO plugs but may be arbitrarily
configured.
By engaging with the clip 29 provided opposite the BH housing 26
via the backplane 23, the BH housing 26 is attached to the
backplane 23 so that the backplane 23 is sandwiched between the BH
housing 26 and the clip 29. The BH housing 26 is arranged at the
printed board 22 side (the right of FIG. 2) of the backplane 23.
The clip 29 is arranged opposite the BH housing 26 via the
backplane 23. In FIGS. 2 and 3, the clip 29 is provided with a pair
of elastic pawls 29b projecting from the opposite sides (the
vertically opposite ends in FIGS. 2 and 3) of main body portion 29a
like a rectangular frame. The backplane 23 is sandwiched between
the clip 29 and the BH housing 26 by engaging the elastic pawls 29b
allowed to penetrate an attaching slot 31 formed in the backplane,
with the BH housing 26. The outer shapes of the BH housing 26 and
the main body portion 29a of the clip 29 are larger than the
attaching slots 31 so as not to fit into the slots 31. Further, the
frame-like space inside the main body portion 29a of the clip 29 is
large enough to allow the optical connector plug 24b to be inserted
into the space. This space is also in communication with the
attaching slot 31. Parts of the backplane 23 and main body portion
29a which are located around the attaching slot 31 do not interfere
with the optical connector plug 24b inserted into and connected to
the BH housing 26 even if the BH housing 26 is moved. These parts
do not affect the state in which the optical connector plug 24b has
been inserted into and connected to the BH housing 26.
Furthermore, the BH housing 26 can be moved within the attaching
slot 31 by ensuring, for example, a movable dimension c in the
lateral direction of FIG. 3 and a movable dimension d in the
vertical direction of FIG. 3 so that both elastic pawls 29b of the
clip 29 are movable. Thus, movement of the BH housing 26 absorbs
the dimensional tolerances when the PH housing 25 is fitted into
the PH housing 26. This allows fitting operations to be performed
more easily.
Furthermore, the main body portion 29a of the clip 29 is bent or
curved (bent in FIGS. 1, 2, and 4) at a vertex 29e in its central
portion in the vertical direction. By abutting the vertex 29e
against the backplane 23, the BH housing 26 can be rotationally
moved easily in a vertical plane around the vertex 29e.
Furthermore, the main body portion 29a itself functions as a plate
spring to ensure the movement range of the BH housing 26. The main
body portion 29a always exerts spring force on the elastic pawls
29b because of reaction force generated when the vertex 29e pushes
the backplane 23. This maintains the contact of engaging pawls 29d
projecting from leading end portions 29c of the elastic pawls 29b
with locking portions 34 of the BH housing 26, under pressure to
prevent disengagement. Furthermore, inadvertent movement
(vibration) of the BH housing 26 is prevented to avoid adverse
effects such as degradation of characteristics caused by
vibration.
In this regard, the clip is not limited to the above configuration
but may be arbitrarily configured. However, with any configuration,
the clip generally allows the BH housing 26 to move.
A plurality of attaching holes 31 are arranged in parallel
(laterally in FIG. 3) in the backplane 23 of the plug-in unit 21. A
plurality of BH housings 26 are mounted in the plug-in unit 21 in
parallel by assembling the BH housings 26 in these attaching slots
31. Furthermore, the printed boards 22 can be inserted into the
plug-in unit 21 correspondingly to the respective BH housings 26.
Thus, connector adapters 27, each composed of the PH housing 25 and
the BH housing 26, can be densely mounted in the BP connector
20.
With the plug-in unit 21, the BH housing 26 into which the PH
housing 25 is fitted can be selected by selectively inserting the
printed board 22 into one of a plurality of guide grooves 32 (see
FIGS. 1 and 3 the guide grooves are not shown in FIG. 2) formed in
an upper and lower bottom plates 30a and 30b (see FIG. 2) of the
plug-in unit 21. On the basis of the accuracy of positioning of the
printed board 22 based on the guide grooves 32, the PH housing 25
is positioned relative to the BH housing 26 and is inserted and
fitted into it.
Specifically, the clip 29 is obtained by molding an elastic plate
material such as a metal plate to form the main body portion 29a
and the pair of elastic pawls 29b.
FIG. 4 shows a structure in which the clip 29 and the BH housing 26
engage with each other. As shown in FIG. 4, the elastic pawls 29b
are inserted, from the backplane 23 side, into corresponding pawl
inserting slots 33 penetrating vertically opposite sides (vertical
sides in FIG. 4) of the BH housing 26. Then, the elastic pawls 29b
are engaged with the BH housing 26 so as not to be successfully
pulled out, by engaging engaging pawls 29d with the corresponding
locking portions 34 provided on the side portions of the BH housing
26, the engaging pawls 29d projecting from side portions of elastic
pawl leading end portions 29c penetrating the corresponding pawl
inserting slots 33 and projecting toward the PH housing 25. The
engaging pawl 29d is formed by obliquely raising a part of the
leading end portion 29c of the elastic pawl 29b like a plate spring
so as to open toward the outside of a corresponding one of the pair
of elastic pawls 29b, that is, in a direction opposite to the
opposite elastic pawl 29b. The engaging pawl 29d projects obliquely
from the leading end portion 29c of the elastic pawl toward the
main body portion 29a.
By being pushed into the corresponding pawl inserting slot 33 from
the backplane 23 side, the elastic pawl 29b is inserted into the
pawl inserting slot 33 while elastically deforming the
corresponding engaging pawl 29d. The engaging pawl 29d of each
elastic pawl 29b penetrates through the pawl inserting slot 33
toward the PH housing 25, while returning to its original
projecting state owing to its own elasticity. The engaging pawl 29d
then engages with a wall-like locking portion 34 provided outside
the BH housing 26 and adjacent to the pawl inserting slot 33. This
stably maintains the engagement between the clip 29 and the BH
housing 26 unless the engaging pawl 29d is pushed in substantially
parallel with the elastic pawl 29b and is disengaged from the
locking portion 34.
Now, description will be given of a clip removing tool 50
(hereinafter simply referred to as a "removing tool 50 ") according
to the present invention. FIG. 5 is a perspective view showing the
removing tool 50. FIGS. 6A to 6D also show the removing tool 50.
FIGS. 7A to 7D show a removing tool main body 51 constituting the
removing tool 50. FIGS. 8A to 8D are part drawings showing a frame
58 of pawl blocks 51A and 51B constituting the removing tool 50.
FIGS. 9A and 9B are part drawings showing disengaging pieces 52a
and 52b attached to the frame 58. FIGS. 10A to 10D show the
configuration of a holding engaging portion 60 provided in the
removing tool 50. FIGS. 11A and 11B show a state observed before
the removing tool 50 is pushed against the BH housing 26. FIGS. 12A
and 12B show an example in which an operation lever 90 is applied
as an operation handle. FIGS. 13A and 13B show that the removing
tool 50 has been pushed against the BH housing 26.
In FIGS. 6A to 6D and 11A and 11B, the clip removing tool 50 is
composed of a removing tool main body 51 advanced toward or
retreated from the BH housing 26, and a pair of pawl blocks 51A and
51B removably attached to the opposite sides of the removing tool
main body 51. Specifically, the pawl blocks 51A and 51B are
installed on and removed from the removing tool main body 51 using
screws 91. The pawl blocks 51A and 51B are configured similarly but
are attached to the removing tool main body 51 at the opposite
positions.
The pawl blocks 51A and 51B are constructed by attaching the
engaging pieces 52a and 52b, respectively, to the frame 58 (see
FIGS. 8A to 8D), made of hard resin, metal, or the like, so that
the engaging pieces 52a and 52b are rotatably supported by a shaft
53. The disengaging pieces 52a and 52b are attached so that their
leading end portion opposite to their proximal end attached
pivotally to the shaft 53 extends to the front of the removing tool
50 in a direction in which the removing tool 50 is pushed against
the BH housing 26 (the left of FIGS. 6A, 6C, 6D, and 11; this
direction will hereinafter sometimes be referred to as "front",
whereas the opposite direction will hereinafter sometimes be
referred to as "rear"). The pawl blocks 51A and 51B each have a
stopper wall 57 protruding from the frame 58 beyond the shaft 53.
The disengaging pieces 52a and 52b each have its leading end pushed
against the stopper wall 57 from the opposite pawl block via the
removing tool main body 51, by a spring 56 provided in each of the
pawl blocks 51A and 51B. However, each of the disengaging pieces
52a and 52b can be displaced from the stopper wall 57 toward the
opposite pawl block via the removing tool main body 51 within the
expansion and contraction range of the spring 56. This makes the
separation between the leading ends of the pair of disengaging
pieces 52a and 52b variable. When the disengaging pieces 52a and
52b each abut against the stopper wall 57, the separation between
the leading ends of the pair of disengaging pieces 52a and 52b is
maximum.
When the removing tool 50 is pushed against the BH housing 26, both
disengaging pieces 52a and 52b are pushed against the respective
leading end portions 29c of the clip 29. Thus, the engaging pawls
29d are disengaged from the locking portions 34 of the BH housing
26.
The disengaging pieces 52a and 52b each have, at a leading end in a
direction in which it projects from the pawl block 51A or 51B,
respectively, an abutting portion 54 that abuts against the leading
end portion 29c of the elastic pawl and an engaging pawl pushing
portion 55 that pushes the engaging pawl 29d of the elastic pawl
29b. While the pair of disengaging pieces 52a and 52b are each
abutting against the stopper wall 57, the distance between the
engaging piece pushing portions 55 of the disengaging pieces 52a
and 52b substantially equals the distance between the pair of
engaging pieces 29d of the clip 29. Furthermore, the distance
between the abutting portions 54 of the disengaging pieces 52a and
52b substantially equals the distance between the leading end
portions 29a of the pair of elastic pawls of the clip 29.
Accordingly, by pushing the removing tool 50 into the BH housing
26, the engaging piece pushing portions 55 of the disengaging
pieces 52a and 52b can be pushed against the pair of engaging
pieces 29d of the clip 29. Furthermore, the abutting portions 54 of
the disengaging pieces 52a and 52b can be pushed against the
leading end portions 29a of the pair of elastic pawls of the clip
29.
A holding engaging portion 60 projecting from the removing tool
main body 51 and between the disengaging pieces 52a and 52b is
elongated so as to be inserted into a plug slot 28a (see FIG. 21)
penetrating an internal housing 28 incorporated in the BH housing
26. The holding engaging portion 60 has, on its side portion, a
rising-and-sinking engaging piece 64 that can rise and sink freely,
to provide the following function: by inserting the holding
engaging portion 60 into the plug slot 28a and engaging the
engaging piece 64 with the internal housing 28, the BH housing 26
from which the clip 29 has been removed can be held in the removing
tool 50.
As shown in FIGS. 5, 6A to 6D, and 10A to 10D, the holding engaging
portion 60 is constructed by assembling a plurality of parts on a
central shaft 61. The configuration of the holding engaging portion
60 will be specifically described below.
A leading end portion (a side directed toward the front of the
removing tool 50) of the central shaft 61 is housed in a cap-like
(bottomed-cylinder-like) inserting cap 62. The inserting cap 62 can
be pushed in along the axial direction of the central shaft 61
toward the proximal end of the central shaft 61, i.e. toward the
removing tool main body 51. The inserting cap 62 can be pushed in
toward the proximal end of the central shaft 62 within the range of
expansion and contraction of a spring 65 housed in the clearance
between the leading end of the central shaft 61 and a bottom
surface of a internal space 62a of the inserting cap 62 which
surface is located at the leading end portion of the cap (the left
of FIGS. 10A, 10C, and 10D) (for the state in which the inserting
cap 62 has been pushed in, see FIG. 20). Furthermore, after the
push-in operation, the inserting cap 62 returns to the state shown
in FIGS. 10A to 10D because of the urging force of the spring
65.
The rising-and-sinking engaging piece 64 is provided in a concave
61a opened in a side portion of the central shaft 61. It is
supported by a shaft 63 provided in the concave 61a so as to be
rotatable around an axis of rotation orthogonal to the axial
direction of the central shaft 61. When the rising-and-sinking
engaging piece 64 rotates around the shaft 63, an engaging leading
end 64a rises from and sinks into the side portion of the central
shaft 61, the engaging leading end 64a projecting from the proximal
end of the rising-and-sinking engaging piece 64 which is pivotally
attached to the shaft 63. A spring 61d provided in the concave 61a
functions to push the engaging leading end 64a from the concave 61a
to the side portion of the central shaft 61.
The concave 61a is housed in the inserting cap 62. A window 62b is
opened in a side wall portion of the inserting cap 62. The concave
62b is large enough to allow the engaging leading end 64a of the
rising-and-sinking engaging piece 64 to be inserted into the
window. The engaging leading end 64a of the rising-and-sinking
engaging piece 64 projects from the side portion of the inserting
cap 62 through the window 62b, which is in communication with the
opening of the concave 61a. In this case, the rising-and-sinking
engaging piece 64 also functions to prevent the inserting cap 62
from slipping out toward the leading end of the central shaft 61.
That is, a stopper portion 64b projecting from the
rising-and-sinking engaging portion 64 abuts against an inner
surface of the concave 61a to regulate such rotation of the
rising-and-sinking engaging piece 64 (counterclockwise rotation in
FIG. 10A) as the engaging leading end 64a moves toward the leading
end of the holding engaging portion 60. Accordingly, the location
at which the rear-end-side (the right of FIG. 18A) inner surface of
the window 62b of the inserting cap 62 abuts against the
rising-and-sinking engaging piece 64 (specifically, the engaging
leading end 64a) constitutes a limit on movement of the inserting
cap 62 toward the leading end of the holding engaging portion
60.
In FIG. 10A and others, the stopper portion 64b is illustrated
projecting from the proximal end of the rising-and-sinking engaging
piece 64 so as to extend toward the leading end of the holding
engaging portion 60 relative to the shaft 63, constituting the
center of rotation of the rising-and-sinking engaging piece 64.
However, the stopper portion formed in the rising-and-sinking
engaging piece is not limited to this aspect. Various
configurations are available provided that the stopper portion
abuts against the inner surface of the concave 61a to regulate such
rotation of the rising-and-sinking engaging piece as moves the
engaging leading end toward the leading end of the holding engaging
portion 60.
As shown in FIG. 20, the inserting cap 62 is pushed in toward the
rear of the removing tool 50 relative to the central shaft 61 while
pushing and contracting the spring 65. Then, the engaging leading
end 64a is pushed in toward the rear of the removing tool 50 by the
inner surface of the window 62b located at the front end of the
removing tool 50. At the same time, the engaging leading end 64a is
pushed into the concave 61a while rotating the rising-and-sinking
engaging piece 64 to elastically deform the spring 61d (in this
case, the spring 61d is pushed and contracted between the engaging
leading end 64a and the inner wall surface of the concave 61a).
When the pushing force directed toward the rear of the removing
tool 50 relative to the central shaft 61 of the inserting cap 62 is
cleared, the inserting cap 62 is pushed back toward the front of
the removing tool 50 along the central shaft 61 because of the
urging force of the spring 65 as shown in FIG. 10A. Then, when the
engaging leading end 64a of the rising-and-sinking engaging piece
64 can enter the window 62b, the urging force of the spring 61d
causes the engaging leading end 64a of the rising-and-sinking
engaging piece 64 to enter the window 62b and then project out from
the window 62b.
That is, with the holding engaging portion 60, moving the inserting
cap 62 along the axial direction of the central shaft 61 allows the
rising-and-sinking engaging portion 60 to rise from or sink into
the window 62b, formed in the side portion of the inserting cap
62.
The central shaft 61 has, at its proximal end opposite to the
leading end, a pushing member 66 provided outside the central shaft
61 so as to be movable along the axial direction of the central
shaft 61 and a spring 67 interposed between a pressure receiving
portion provided in the central shaft 61 and the pushing member 66,
so as to expand and contract freely along the central shaft 61.
The holding engaging portion 60 projects from the removing tool
main body 51 when an inserted and fixed portion 68 provided on the
proximal end of the central shaft 61 is inserted into and fixed to
the removing tool main body 51.
Specifically, the inserted and fixed portion 68 is a fixed ring
inserted/fixed to the outside of the central shaft 61 (the inserted
and fixed portion will hereinafter be sometimes referred to as a
"fixed ring"). To attach the holding engaging portion so that it
cannot be pulled out, the fixed ring 68 is first fitted and housed
in a fixing hole 51a opened in a front surface of the removing tool
main body 51 in a direction in which the removing tool main body 51
is pushed, the fixing hole 51a extending toward the rear of the
removing tool main body 51. Then, the fixed ring 68 is fixed to the
removing tool main body 51 using fixing means such as a screw 92.
Specifically, as shown in FIG. 6A, to fix the holding engaging
portion 60 so that it cannot be pulled out from the removing tool
main body 51, the screw 92 is screwed into a threaded hole 61e
formed at the rear end of the central shaft 61, the screw 92 being
inserted into a hole 51c (see FIGS. 7A, 7C, and 7D) from the rear
surface of the removing tool main body 51, the hole 51c being
formed in the rear surface so as to lead to the fixing hole 51a and
penetrate the removing tool main body 51. Removing the screw 92
allows the holding engaging portion 60 to be separated from the
removing tool main body 51. Furthermore, the orientation of the
holding engaging portion 60 around the central shaft 61 is
determined depending on the engagement between a key groove 68a
(see FIGS. 10A to 10C) formed in a side portion of the fixed ring
68 and a key 51b projecting from an inner surface of the fixing
hole 51a.
The key and key groove, which determine the fixing orientation of
the holding engaging portion 60 to the removing tool main body 51,
may be formed on the fixed ring 68 and in the fixing hole 51a in
the removing tool main body 51, respectively.
The fixed ring 68 also functions as the pressure receiving portion
for the spring 67. That is, the spring 67 is interposed between the
fixed ring 68 as the pressure receiving portion and the pushing
member 66, arranged in front of the fixed ring 68. When the spring
67 is pushed and contracted as the pushing member 66 is pushed in
backward along the central shaft 61, it receives reaction force
from the fixed ring 68 to urge the pushing member 66 forward.
Specifically, the pushing member 66 is a ring inserted around the
central shaft 61. The pushing member 66 is restrained from moving
forward from the position at which it abuts against a fixing block
portion 61b extending from an axially central portion to opposite
sides of the central shaft 61. Furthermore, the pushing member 66
is pushed against the fixing block portion 61b by the urging force
of the spring 67.
A pair of slide bars 69a and 69b extending at the respective sides
of and along the central shaft 61 are fixed to the fixing block
portion 61b, formed in the axially central portion of the central
shaft 61. The slide bars 69a and 69b extend forward from the fixing
block portion 61b. The leading end of the central shaft 61 and the
leading end of the slide bars 69a and 69b, arranged side by side at
the respective sides of the central shaft 61, are housed in the
inserting cap 62. The inserting cap 62 can freely slide forward and
backward along the longitudinal direction (extending direction) of
the two slide bars 69a and 69b. This accomplishes stable support
and smooth movement.
The fixing block portion 61b functions as both a fixing portion for
the slide bars 69a and 69b and a stopper that sets a limit on
forward movement of the pushing member 66. However, it should be
appreciated that a different configuration can be employed which
provides the function of the fixing block portion 61b as a fixing
portion for the slide bars 69a and 69b and its function as a
stopper that sets a limit on forward movement of the pushing member
66, using separate members or the like.
The fixing block portion 61b is an extended portion projecting from
the central shaft 61. However, the fixing block portion 61b is not
limited to this aspect, and a different configuration can be
employed, and for example, a configuration in which the fixing
block portion 61b is composed of a separate part fixed to the
outside of the central shaft 61.
FIGS. 11A and 11B show an example in which the printed board 22 is
attached to the removing tool main body 51 as an operation handle.
FIGS. 13A and 13B show an example in which a rod-like operation
lever 90 is attached to the removing tool main body 51 as an
operation handle.
As shown in FIGS. 11A and 11B, the printed board 22 is screwed and
fixed to a side portion of an attachment 59 projecting from a rear
portion of the removing tool main body 51.
As shown in FIGS. 13A and 13B, the operation lever 90 is inserted
and screwed into a screw hole opened in a rear surface (the right
of FIGS. 13A and 13B) of a block-like attachment 59a fixed to the
rear surface of the removing tool main body 51. Thus, the operation
lever 90 is fixed to the removing tool main body 51 via the
attachment 59a.
Using these operation handle 22 or 90 enables the efficient
performance of operations such as pushing the clip removing tool 50
against the BH housing 26 mounted on the backplane 23 located
deeply inside the plug-in unit 21 or drawing the clip removing tool
50 out from the plug-in unit 21.
If the printed board 22 is attached as an operation handle, then
simply by pushing and inserting the printed board 22 into the
plug-in unit 21, the removing tool 50 can be advantageously pushed
against the BH housing 26 while accurately positioning the removing
tool 50 on the BH housing 26 with an alignment accuracy of the
printed board 22 to the plug-in unit 21. Furthermore, the clip 29
can be efficiently removed from the BH housing 26.
FIGS. 21 to 23A and 23B show a specific example of the BH housing
26.
In FIGS. 21 to 23A and 23B, the BH housing 26 is configured to
house and hold only one optical connector plug 24b as an MPO plug.
The BH housing 26, in combination with the PH housing 25, shown in
FIG. 1, constitutes a BP connector that connects the optical
connector plugs 24a and 24b, MPO plugs, together in a one-to-one
correspondence. When the PH housing 25 is fitted into the BH
housing 26 to constitute an optical connector adapter 27, an
optical connector plug 25a inserted into the PH housing 25 for
engagement and retention is connected to the optical connector plug
24b inserted into the BH housing 26 for engagement and
retention.
The BP housing 26 is composed of a prismatic housing main body 35
and an internal housing 28 housed in an internal space 36
penetrating the housing main body 35 by inserting it into the
internal space 36 from a surface 37 abutting against the backplane
23. The internal housing 28 is shaped like a sleeve through which a
plug hole 28a is penetrated. The internal housing 28 is, for
example, entirely formed of synthetic resin such as plastics.
The BH housing 26 is assembled (FIGS. 22 and 23A show how it is
assembled) by housing the internal housing 28 in the housing main
body 35. The internal housing 28 inserted into the internal space
36 of the BH housing 26 from the abutting surface 37 abuts abutting
pieces 28b projecting from the vertically opposite side portions
(the vertical direction in FIGS. 21 and 22) of the housing 28,
against corresponding stopper walls 38 provided in the PH housing
25 so as to lie opposite the abutting surfaces 37 in the housing
main body 35. The internal housing 28 also engages holding engaging
pawls 28c projecting from laterally opposite sides (from upper left
to the lower right of FIGS. 21 and 22 and the vertical direction in
FIG. 23A), with engaging projections 39 formed in laterally
opposite sides of the internal space 36 of the housing main body
35. The stopper walls 38 serve to prevent the internal housing 28
from slipping out toward the PH housing 25. By engaging with the
corresponding holding engaging pawls 28c, the engaging projections
39 serve to prevent the internal housing 28 from slipping out
toward the backplane 23. This allows the internal housing 28 to be
housed and held at a predetermined position in the housing main
body 35 of the BH housing 26.
A pawl inserting slot 33 is formed like a slit penetrating the
projecting proximal end of a locking portion 34 projecting from
each of the vertically opposite side portions of the housing main
body 35. By pushing in the leading end portion 29c of the elastic
pawl from the abutting surface 37 side, the engaging pawl 29d can
be passed through the pawl inserting slot 33 in such a manner that
the elastically deformed engaging pawl 29d is pushed into a slot
29f (see FIG. 21) in the leading end portion 29c of the elastic
pawl. The engaging pawl 29d passed through the pawl inserting slot
33 returns to its original projecting state owing to its own
elasticity. The engaging pawl 29d is then opened from the elastic
pawl 28b so as to project out from the BH housing 26. The engaging
pawl 29d then engages with the engaging portion 34 as shown in FIG.
4. The engaging pawl 29d with which the locking portion 34 has been
engaged is exposed so as to face the PH housing 25. As described
later, when the clip removing tool 50 is continuously pushed
against the BH housing 26, the engaging pawl pushing portions 55 of
disengaging pieces 52a and 52b of the clip removing tool 50 push
the corresponding engaging pawls 29d from the outside of the BH
housing 26 to reduce the amount of part of each engaging pawl 29d
which projects from the elastic pawl 29b. Thus, the engaging pawl
29d is disengaged from the locking portion 34. This allows the clip
29 to be removed easily.
As shown in FIG. 23B, a pair of connector holding pawls 40 project
from opposite sides of the plug slot 28a in the internal housing
28. The connector holding pawls 40 are elastic pawls that hold
optical connector plug 24b by removably engaging with engaging
concaves (not shown) provided on opposite side portions of the
optical connector plug 24b inserted from the backplane 23.
As shown in FIGS. 21, 22, and 23A and 23B, the internal housing 28
of the BH housing 26, which holds the MPO plug, the optical
connector plug 24b, is provided with the plug slot 28a the shape of
which coincides with the outer shape of the MPO plug. The key
groove 28g, the shape of which is obtained by extending one side
portion of the plug slot 28a in the direction x of its minor axis
(see FIG. 22), i.e., the lateral direction of the plug slot 28a,
enables the optical connector plug 24b to be inserted into the plug
slot 28a only in a predetermined orientation. The connector holding
pawls 40 are arranged on the opposite sides of the plug slot 28a in
the direction y of its major axis, i.e., on the opposite sides in
the vertical direction. The connector holding pawls 40 are formed
at positions different from those at which the holding engaging
pawls 28c are formed with respect to the housing main body 35 of
the internal housing 28.
Now, with reference to FIGS. 11 to 20 and others, description will
be given of a clip removing method using the removing tool 50. The
removing tool 50 also functions as a holding tool that holds the
optical connector (BH housing 26) in the clip removing method.
FIG. 11 shows a state observed before the removing tool 50 is
pushed against the BH housing 26. Then, the removing tool 50 is
inserted deeply into the plug-in unit 21 (to a position closer to
the backplane 23) so as to be pushed against the BH housing 26.
Thus, first, the holding engaging portion 60 projected forward from
the pair of disengaging pieces 52a and 52b is inserted into the
plug slot 28a in the internal housing 28 of the BH housing 26.
Then, the engaging pawl pushing portions 55 of the pair of
disengaging pieces 52a and 52b are pushed against the engaging
pawls 29d of the pair of elastic pawls 29b of the clip 29.
The inserting cap 62, located at the leading end of the holding
engaging portion 60, has a sectional shape substantially matching
that of the plug slot 28a. The holding engaging portion 60 is fixed
to the removing tool main body 51 in the orientation in which the
inserting cap 62 can be inserted into the plug slot 28a, i.e., in
the orientation in which a key 62c projecting from a side portion
of the inserting cap 62 is inserted into the key groove 29g in the
plug slot 28a. The holding engaging portion 60 is inserted into the
plug slot 28a before the disengaging pawls 52a and 52b abut against
the corresponding elastic pawls 29b. This allows the removing tool
50 to be positioned on the BH housing 26. As a result, the removing
tool 50 can be pushed against the BH housing 26 in the correct
orientation. Furthermore, the disengaging pawls 52a and 52b can be
abutted and pushed precisely against the corresponding elastic
pawls 29b.
As shown in FIG. 23C, an inserting operation allows the leading end
of the holding engaging portion 60 to be inserted into the internal
housing 28 so as to push aside the opposite connector holding pawls
40 of the internal housing 28. The leading end of the holding
engaging portion 60 then projects from the backplane 23 side of the
internal housing 28, i.e., from the attaching slot 31. The leading
end of the holding engaging portion 60 is tapered. This allows the
pair of connector holding pawls 40 to be smoothly pushed aside and
allows the leading end of the holding engaging portion 60 to be
smoothly inserted into the plug slot 28a.
The rising-and-sinking engaging piece 64 projecting out from the
window 62b in the inserting cap 62 has such an angular shape that
the amount of part of it which projects from the inserting cap 62
increases from front to rear of the engaging piece. Consequently,
as the inserting cap 62 is inserted into the plug slot 28a, it
abuts against the internal housing 28 around the opening end of the
plug hole 28a and is thus pushed gradually into the concavity 61.
The inserting cap 62 thus enters the plug slot 28a. Then, as shown
in FIG. 17, the holding engaging portion 60 is inserted into the
plug slot 28a in such a way that the rising-and-sinking engaging
piece 64 projecting out from the window 62b in the inserting cap 62
abuts against the inner wall of the plug slot 28a and is thus
pushed into the concavity 61a. The rising-and-sinking engaging
piece 64 slidably moves on the inner wall of the plug slot 28 as
the holding engaging portion 60 is pushed into the plug slot 28,
while remaining pushed against the inner wall surface of the plug
slot 28a owing to the urging force of the spring 61d incorporated
in the concavity 61a. As shown in FIG. 18, when the
rising-and-sinking engaging piece 64 slips out of the backplane
23-side end of the plug slot 28a, it projects out from the window
62b in the inserting cap 62. Consequently, the rising-and-sinking
engaging piece 64 can be engaged with the internal housing 28.
In this regard, before the rising-and sinking engaging piece 64
slips out of the back plane 23-side of the plug slot 28a and
projects out from the window 62b in the inserting cap 62 for
engagement with the internal housing 28, the holding engaging
portion 60 is inserted into the plug slot 28a to push the pushing
member 66 of the holding engaging portion 60 against the internal
housing 28. The pushing member 66 is thus relatively retreated to
start pushing and contracting the spring 67. Furthermore, it
becomes possible for the rising-and-sinking engaging piece 64 to
engage with the internal housing 28 before the clip 29 is
disengaged from the BH housing 26 using the removing tool 50,
specifically, before the pair of disengaging pieces 52a and 52b
disengage the engaging pawls 29d of the clip 29 from the
corresponding locking portions 34 of the BH housing 26.
The pushing member 66 is shaped so as not to enter the plug slot
28a but to abut against the internal housing 28 when the holding
engaging portion 60 is inserted into the plug slot 28a.
FIGS. 14 to 16 shows the neighborhood of one 52a of the disengaging
pieces. Although FIG. 15 shows one of the disengaging pieces, the
pair of disengaging pieces 52a and 52b have similar shapes and
attached to the clip removing tool 50 in the opposite directions.
Furthermore, the pair of disengaging pieces 52a and 52b act
similarly on the pair of elastic pawls 29b to substantially
simultaneously disengage them from the locking portions 34.
FIG. 14 shows a state observed before the disengaging pieces 52a
and 52b are pushed against the pair of elastic pieces 29b of the
clip 29. The removing tool 50 is pushed against the BH housing 26.
Then, as shown in FIG. 15, first, the engaging pawl pushing
portions 55 of the disengaging pieces 52a and 52b abut against the
corresponding engaging pawls 29d of the pair of elastic pawls 29b
of the clip 29. As the removing tool 50 is further pushed against
the BH housing 26, the engaging pawl pushing portions 55 slidably
moves toward the back plane 23 while remaining in substantial
sliding contact with the outer surfaces (the surfaces from which
the engaging pawls 29d are raised) of the corresponding elastic
pawls 29b. The engaging pawl pushing portions 55 push the
corresponding engaging pawls 29d so as to preclude them from
projecting from the corresponding elastic pawls 29b. That is, after
the engaging pawls 29d, formed by folding a part of the elastic
pawls 29b so as to raise them, have been raised, the engaging pawl
pushing portions 55 push the engaging pawls 29d into the
corresponding slots 29f in the elastic pawl leading ends 29c so as
to push the engaging pawls down. In this case, the disengaging
pieces 52a and 52b abut against the stopper walls 57 formed in the
frames 58 of the pawl blocks 51A and 51B, respectively, to prevent
an increase in distance between the leading ends of the pair of
disengaging pieces 52a and 52b, respectively. Accordingly, the
engaging pawl pushing portions 55 reliably push in the
corresponding engaging pawls 29d. Thus, the engaging pawls 29d are
disengaged from the corresponding locking portions 34 of the
housing main body 35 of the BH housing 26.
The disengaging pieces 52a and 52b are pushed against the
corresponding stopper walls 57 because of the urging force of the
spring 61d, provided between the frames 58 of the pawl blocks 51A
and 51B. Thus, with the distance between the leading ends of the
pair of disengaging pieces 52a and 52b maintained stably, the
disengaging pieces 52a and 52b (specifically, the engaging pawl
pushing portions 55) can be pushed against the corresponding
engaging pawls 29d of the pair of elastic pawls 29b. Therefore, the
disengaging pieces 52a and 52b can be pushed against the
corresponding engaging pawls 29d.
Then, as the removing tool 50 is further pushed against the BH
housing 26, the abutting portions 54 abut against the corresponding
elastic pawl leading ends 29c to push the leading ends 29c.
Accordingly, as shown in FIG. 16, the elastic pawls 29b are pushed
into the corresponding pawl inserting slots 33 in the housing main
body 35. Thus, it becomes impossible to engage the engaging pawls
29d with the corresponding locking portions 34.
The disengaging pieces 52a and 52b are each supported on the
removing tool main body 51 by inserting, over the shaft 53, a slot
52c formed to be extend along the extending direction of the
disengaging pieces 52a and 52b. When the abutting portions 54 start
pushing the corresponding elastic pawl leading end portions 29c,
the disengaging pieces 52a and 52b, provided so that the
longitudinal direction of the slot 52c coincides with the
front-to-rear direction of the removing tool 50, are first pushed
in toward the rear of the removing tool 50 within the extent of the
slot 52c. In the disengaging pieces 52a or 52b, the position at
which the abutting portion 54 abuts against the elastic pawl
leading end portion 29c is closer to the opposite disengaging piece
52a or 52b, respectively, than to its shaft 53 (the center of
rotation of the disengaging piece). By abutting the abutting
portion 54 against the elastic pawl leading end portion 29c to push
it, the disengaging pieces 52a and 52b are each rotated in the
direction in which its leading end approaches the BH housing 26,
i.e., in the direction in which the distance between the tips of
the disengaging pieces 52a and 52b decreases about the shaft 53
with the disengaging pieces 52a and 52b resiliently deforming the
spring 56. This causes the engaging pawl pushing portion 55 of each
of the disengaging pieces 52a and 52b to reliably push the
corresponding engaging pawl 29d into the slot 29f in the elastic
pawl leading end portion 29c. Then, the abutting portion 54 pushes
in the corresponding elastic pawl 29b against the backplane 23 to
smoothly push the elastic pawl 29b into the pawl inserting slot 33
in the housing main body 35.
Once the engaging pawl 29d is pushed into the pawl inserting slot
33 in the housing main body 35, it can be pulled out easily from
the BH housing 26 via the pawl inserting slot 33. Thus, the BH
housing 26 and the clip 29 can be separated easily from each
other.
In the clip 29, in which the main body portion 29e, which itself
acts on the backplane 23 as a plate spring, the engaging pawls 29d
are disengaged from the corresponding locking portions 34 of the BH
housing 26. At the same time, the spring force of the main body
portion 29e causes the elastic pawl leading end portions 29c to be
pulled quickly and reliably into the corresponding pawl inserting
slots 33. This reliably prevents inconveniences such as
reengagement caused by the return of the disengaged engaging pawls
29d to the corresponding locking portions 34.
With the clip removing tool 50, even when the engaging pawls 29d of
the clip 29 are disengaged from the corresponding locking portions
34 of the BH housing 26, the BH housing 26 does not fall from the
backplane 23 but remains in the clip removing tool 50 owing to the
engagement of the holding engaging portion 60 (specifically, the
rising-and-sinking engaging pieces 64) with the internal housing
28, incorporated in the BH housing 26. Accordingly, as shown in
FIG. 19, when the clip removing tool 50 is pulled out from the
plug-in unit 21 after the clip 29 has been removed, the BH housing
26 can be taken out from the plug-in unit 21 together with the clip
removing tool 50. At this time, the clip removing tool 50 functions
as a holding tool that holds the optical connector, the BH housing
26.
Specifically, after the disengagement of the engaging pawls 29d of
the clip 29 from the locking portions 34 of the BH housing 26, when
the removing tool 50 starts to be pulled out from the plug-in unit
21, the BH housing 26 is pulled out from the plug-in unit 21
together with the removing tool 50 with the urging force of the
spring 67 keeping the internal housing 28 held between the pushing
member 66 and the rising-and-sinking engaging piece 64. In this
case, unwanted vibration of the BH housing 26 is prevented by the
retention of the internal housing 28 between the pushing member 66
and the rising-and-sinking engaging pieces 64. This in turn
prevents inconveniences such as catching of the BH housing 26 in
any part of the plug-in unit 21, any optical fiber, or the
like.
As the operation of removing the clip 29 progresses, the abutment
between the abutting portions 54 of the disengaging pieces 52a and
52b of the removing tool 50 and the corresponding elastic pawls 29b
of the clip 29 is cleared. Then, because of the urging force of the
spring 56, the disengaging pieces 52a and 52b return to their state
observed before they are pushed against the BH housing 26.
Furthermore, the removing tool 50 may start to be pulled out from
the plug-in unit 21 after it has been pushed against the BH housing
26 up to a pushing limit, i.e., after the leading ends
(specifically, the engaging pawl pushing portions 55) of the
disengaging pieces 52a and 52b have abutted against the
corresponding locking portions 34 of the housing main body 35 of
the BH housing 26. This operation accomplishes a series of
operations including disengagement of the engaging pawls 29d of the
clip 29 from the corresponding locking portions 34 of the BH
housing 26 and draw-out from the plug-in unit 21 of the BH housing
26 separated from the clip 29.
Once the BH housing 26 has been pulled out from the plug-in unit
21, the inserting cap 62, located at the leading end of the holding
engaging portion 60, is pushed as arrow P in toward the rear of the
removing tool 50, i.e., pushed in toward the removing tool main
body 51 along the holding engaging portion 60 and relatively to the
central shaft 61. Thus, the rising-and-sinking engaging pieces 64
are disengaged from the internal housing 28 to separate the BH
housing 26 from the removing tool 50. In this case, when the
inserting cap 62 is pushed in toward the removing tool main body 51
along the holding engaging portion 60 and relatively to the central
axis 61, the side wall of the inserting cap 62 forming the inner
surface of the front end (the leading end of the holding engaging
portion 60) of the window 62b of the inserting cap 62 pushes the
corresponding rising-and-sinking engaging pieces 64 down to the
rear side (to the proximal end of the holding engaging portion 60;
namely, to the removing tool main body 51). The rising-and-sinking
engaging pieces 64 are pushed into the corresponding concaves 61a
and are prevented from projecting from the side portion of the
inserting cap 62.
Once the rising-and-sinking engaging pieces 64 are disengaged from
the internal housing 28, the urging force of the spring 67 causes
the pushing member 66 to push the internal housing 28 to the
leading end of the holding engaging portion 60. Then, the BH
housing 26 can be taken out easily from the removing tool 50.
For the removing tool 50, the pushing member 66 is formed like a
ring that abuts only against the internal housing 28. The pushing
member is not limited to this aspect. It is possible to provide a
configuration that abuts against the housing main body 35 of the BH
housing 26, a configuration that abuts against both housing main
body 35 and internal housing 28, or the like. Advantageously,
provided that the pushing member is configured to sandwich only the
internal housing 28 between itself and the rising-and-sinking
engaging pieces 64, it can stably sandwich and hold the internal
housing 28 between itself and the rising-and-sinking engaging
pieces 64 regardless of movement of the internal housing relative
to the housing main body. Furthermore, this sandwiched and held
state can be accomplished regardless of the specific structure of
the housing main body.
The separation between the disengaging pieces 52a and 52b can be
changed by replacing the removing tool main body of the removing
tool 50 with a different one and attaching the pawl blocks 51A and
51B to the respective sides of the new removing tool main body.
This allows clip removal for a BH housing having any size.
FIG. 24 is an exploded perspective view showing a multi
(quadruple-backplane-connector) 20A (hereinafter sometimes referred
to as a "BP connector 20A") corresponding to connection of plural
(four) pairs of optical connector plugs 24a and 24b (in FIG. 24,
MPO plugs) (however, the plug-in unit 21 is not shown). A backplane
housing 71 (hereinafter sometimes referred to as a "BH housing 71")
for the BP connector 20A is structured so that an internal housing
73 is housed in a prismatic housing main body 74; a plurality of
(four) plug slots 72 are formed in line in the internal housing 73.
A printed board housing 75 (hereinafter referred to as a "PH
housing 75") in which a plurality of (four) plug slots 75a are
similarly formed is attached to the printed board 22. Then, by
moving the printed board 22 to the backplane 23 to fit the PH
housing 75 into the BH housing 71, a plurality of optical
connectors 24a inserted into the respective plug slots 75a in the
PH housing 75 for engagement and retention are connected altogether
to a plurality of optical connector plugs 24b inserted into the
respective plug slots 72 in the BH housing 71 for engagement and
retention.
The internal housing 73 is kept housed in the housing main body 74
of the BH housing 71 using a mechanism similar to that for the BH
housing 26 illustrated in FIGS. 21 to 23A and 23B. That is, the
internal housing 73 is housed stably at a predetermined position
within the housing main body 74 by engaging holding engaging pawls
of the internal housing 73 with the housing main body 74, abutting
abutting pieces 73a of the internal housing 73 against
corresponding stopper portions 74a of the housing main body 74, and
performing other operations. The internal housing 73 is elongate.
The plurality of plug slots 72 are arranged along the longitudinal
direction of the internal housing 73. Furthermore, the housing main
body 74 is shaped like a prism also having an elongate rectangular
cross section corresponding to the internal housing 73. The housing
main body 74 is provided with the pawl inserting slot 33 and the
locking portion 34 at each of its longitudinally opposite ends as
in the case with the BH housing 26, shown in FIGS. 4, 21, and 22,
and other figures.
A clip 79 used to attach the BH housing 71 to the backplane 23 has
a main body portion 79a shaped like an elongate frame
correspondingly to the BH housing 71 compared to the clip 29
applied to the BH housing 26, shown in FIGS. 21 and 22, and other
figures. However, the other arrangements are similar to those of
the clip 29 applied to the BH housing 26, for example, the pair of
elastic pawls 29b projecting from the longitudinally opposite end
portions of the main body portion 79a and the engaging pawls 29d
formed at the leading ends of the corresponding elastic pawls
29b.
A method of engaging the clip 79 with the BH housing 71 and a
structure in which the clip 79 is mounted on the backplane 23 are
similar to those for the BH housing 26, shown in FIGS. 21 and 22,
and other figures. That is, the engaging pawls 29d of the elastic
pawl leading end portions 29c are inserted into and penetrating
through the corresponding pawl inserting slots 33 formed in the
opposite side portions of the BH housing 71 (specifically, the
housing main body 74) through the attaching slot 31a (FIGS. 28A and
28B). The engaging pawls 29d are then engaged with the
corresponding locking portions 34 to sandwich the backplane 23
between the BH housing 71 and the clip 79. On the basis of the
movable range of the elastic pawl 29d within the attaching slot 31a
and the range of elastic deformation of the main body portion 79a
of the clip 79, the BH housing 71 is mounted on the backplane 23
while maintaining the desired movement range. Also, as in the case
with the BH housing 26, shown in FIGS. 21 and 22, and other
figures, the engaging pawls 29d of the elastic pawl leading end
portions 29c are kept locked on the corresponding locking portions
34 of the BH housing 71 by abutting a top portion 79e formed by
curving or bending (in FIG. 24, bending) the main body portion 79a,
against the backplane 23 to allow the main body portion 79a to
exert its own spring force.
However, the attaching slot 31a opened in the backplane 23 is large
enough to allow the optical connector plug 24b to be inserted into
each of the plug slots 72 in the BH housing 71 (specifically, the
internal housing 73) and to prevent interference with the optical
connector plug 24b associated with movement of the BH housing 71.
It is larger than the attaching slot 31 shown in FIG. 21 or the
like.
FIGS. 25 to 35 show a clip removing tool 80 (hereinafter sometimes
referred to as a "removing tool 80") applied to removal of the clip
79 from the BH housing 71 of the BP connector 20A.
In FIGS. 25 to 28A and 28B, the removing tool 80 comprises a
block-like removing tool main body 81 having the pawl blocks 51A
and 51B attached to its opposite side portions. Thus, the
dimensions of the removing tool main body 81 allow the separation
between the disengaging pieces 52a and 52b of the pawl blocks 51A
and 51B, respectively, to correspond to the positions at which the
engaging pawls 29d engage with the corresponding locking portions
34 located on opposite sides of the BH housing 71. The pawl blocks
51A and 51B are removably attached to the removing tool main body
81 using screws 91.
Furthermore, two holding engaging portions 60 are attached to the
removing tool main body 81. As shown in FIGS. 27A to 27D, the
removing tool main body 81 is provided with fixing holes 81a in
which the corresponding holding engaging portions 60 are fixed. The
fixing holes 81a are shaped similarly to the fixing hole 51a formed
in the removing tool main body 51 of the removing tool 50,
previously described. The holding engaging portions 60 are fixed as
in the case with the fixing hole 51a. Furthermore, also as with the
fixing hole 51a in the removing tool main body 51 of the removing
tool 50, the holding engaging portions 60 are fixed in a
predetermined orientation by engaging keys 81b formed in the fixing
holes 81a with corresponding key grooves 68a in the respective
holding engaging portions 60.
Also as with the removing tool main body 51, previously described,
the selected removing tool main body 81 must be configured so that
the orientation of the holding engaging portions 60 with respect to
the removing tool main body corresponds to that of the plug slots
72 in the internal housing 73 of the BH housing 71 to which the
removing tool 80 is applied. Specifically, for the BH housing 26 to
which the removing tool 50 is applied, the direction y of sectional
major axis (see FIG. 22) of the plug slot 28a in the internal
housing 28 substantially coincides with the vertical direction (the
direction between the pair of pawl inserting holes 33 in the
housing main body 35; namely, the vertical direction of FIG. 22) of
the BH housing 26. The direction x of minor axis orthogonal to the
direction of the major axis substantially coincides with a lateral
direction orthogonal to the vertical direction. On the other hand,
as shown in FIG. 24, for the BH housing 71 to which the removing
tool 80 is applied, each of the plug slots 72 in the internal
housing 73 has the same sectional shape as the plug slot 28a in the
BH housing 26. However, as is apparent from the position of the key
groove 72a, the width of the plug slot 72 in the direction of its
minor axis substantially coincides with the width of the housing
main body 74 in the vertical direction (in FIG. 24) corresponding
to the longitudinal direction of the housing main body 74.
Furthermore, the width of the plug slot 72 in the direction of its
major axis substantially coincides with the width of the housing
main body 74 in a lateral direction orthogonal to the vertical
direction. As a result, the direction of the plug slots is at
90.degree. with the direction of the plug slot in the BH housing 26
to which the removing tool 50 is applied. Accordingly, the
orientation in which the holding engaging portion 60 is fixed to
the removing tool main body 81 is at 90.degree. with the
orientation in which the holding engaging portion is fixed to the
removing tool main body 51 of the removing tool 50.
An operation of removing the clip 79 using the removing tool 80 can
be easily performed exactly like the operation of removing the clip
29 using the removing tool 50, shown in FIGS. 11 to 19, and other
figures.
Furthermore, the printed board 22 or the operation lever 90 can be
attached to the removing tool main body 81 using the attachment 59
provided at the rear end of the removing tool main body 81 in a
direction in which it is pushed against the BH housing 71.
Accordingly, the printed board 22 or the operation lever 90 can be
used as an operation handle to efficiently perform operations such
as insertion and removal of the clip into and from the plug-in unit
21 and advancement and retreat of the plug-in unit toward and from
the BH housing 71.
How the operation lever 90 is attached is not shown. However, the
removing tool main body 81 has a screw hole 59b formed in its rear
end surface, so that the operation lever 90 can be attached by
screwing the lever into the screw hole 59b. At this time, a part of
the removing tool main body 81 which is located around the screw
hole 59b functions as an attachment.
The removing tool main body 81 is provided with a plurality of (in
this case, two) holding engaging portions 60 projecting from the
main body 81. The holding engaging portions 60 are inserted into
and engaged with the internal housing 73 incorporated in the BH
housing 71 so as to stably support the BH housing 71 when the clip
79 is removed. At this time, the clip removing tool 80 also
functions as a holding tool that holds the BH housing 71 as an
optical connector. As shown in FIG. 28B and other figures, the
internal housing 73, incorporated in the BH housing 71, is provided
with the connector holding pawl 40 for each of the plug slots 72,
like the internal housing 28 of the BH housing 26 shown in FIGS.
23A to 23C, and other figures. The holding engaging portions 60 can
support the BH housing 71 by engaging the connector holding pawls
40 with engaging concaves 60a.
To stably support the BH housing 71, the holding engaging portions
60 are inserted into all or selected ones of the plurality of plug
slots 72 in the BH housing 71 (in FIG. 29 and other figures, two of
the plug slots 72 which are located at the opposite ends of the
arrangement) so as to substantially evenly and stably support the
load of the BH housing 71 instead of maldistributing it. It should
be appreciated that the removing tool main body must be properly
selected to enable the holding engaging portions 60 to be attached
so as to project from the positions of the plug slots 72 in the
internal housing 73 of the BH housing 71.
Specific description will be given of a method of removing the clip
79 using the removing tool 80.
As shown in FIG. 33 (in this figure, however, illustration of the
clip 79 is omitted), the removing tool 80 is inserted into the
plug-in unit 21 and moved closer to the BH housing 71 attached to
the backplane 23. Then, as shown in FIGS. 29A and 29B and 34, the
holding engaging portions 60 are inserted into the plug slots 72 in
the internal housing 73 of the BH housing 71. Furthermore, the
rising-and-sinking engaging pieces 64 are moved so as to slip out
of the backplane 23 side of each plug slot 72, and are thus
projected from the side portion of the inserting cap 62.
Furthermore, the removing tool 80 is further pushed into the
plug-in unit 21 to cause the engaging pawl pushing portions 55 of
the disengaging pieces 52a and 52b of the pawl blocks 51A and 51B,
arranged on the opposite sides of the removing tool 80, to push the
engaging pawls 29d of the elastic pawls 29b, arranged on the
opposite sides of the clip 79, so as to push the engaging pawls 29d
down. Thus, the engaging pawls 29d are pushed into the
corresponding slots 29f in the elastic pawls 29b and are thus
disengaged from the corresponding locking portions 34 of the BH
housing 71. As the removing tool 80 is pushed in, the pawl blocks
51A and 51B, arranged on the opposite sides of the removing tool
80, perform operations similar to the operations (previously
described with reference to FIGS. 14 to 16) of disengaging the
engaging pawls 29d of the clip 29 from the corresponding locking
portions 29d of the BH housing 26 and pushing the elastic pawls 29b
into the pawl inserting slots 33 in the BH housing 71, the
operations being performed by the pair of pawl blocks 51A and 51B
of the removing tool 50, previously described. Then, when the
removing tool 80 reaches the pushing limit (the position at which
the engaging pawl pushing portions 55 of the disengaging pieces 52a
and 52b abut against the corresponding locking portions 34 of the
BH housing 71), the elastic pawls 29b are pushed into the
corresponding pawl inserting slots 33 in the BH housing 71. Thus,
the clip 79 is reliably disengaged from the housing main body 74 of
the BH housing 71.
Once the clip 79 is disengaged from the housing main body 74 of the
BH housing 71, the removing tool 80 is pulled out from the plug-in
unit 21 as shown in FIGS. 30 and 35. Thus, since the
rising-and-sinking engaging pieces 64 of the holding engaging
portions 55 are engaged with the internal housing 73 of the BH
housing 71, the BH housing 71 is pulled out from the plug-in unit
21 integrally with the removing tool 80.
The BH housing 71 is pulled out with its internal housing 73
remaining sandwiched between the rising-and-sinking engaging pieces
64 of the plurality of holding engaging portions 60 and the pushing
members 66 because of the urging force of the spring 67.
In this regard, in the configuration in which the BH housing 71 is
pulled out while being held by the holding engaging portions 60,
the range of expansion and contraction of the spring 67 permits the
BH housing 71 to oscillate slightly. Advantageously, this
substantially avoids inconveniences during a draw-out operation; it
prevents any optical part of the plug-in unit 21 from coming into
contact with and being damaged by the BH holder 71 or prevents any
optical fiber from being caught and cut by the BH housing 71.
After the BH housing 71 has been pulled out from the plug-in unit
21, the rising-and-sinking engaging pieces 64 are disengaged from
the internal housing 73 by pushing the inserting caps 62 of the
holding engaging portions 60 toward the proximal ends of the
holding engaging portions. 60 (toward the removing tool main body
81) as shown in FIGS. 31A and 31B. As a result, as shown in FIGS.
32A and 32B, the BH housing 71 is separated from the removing tool
80.
It should be appreciated that the present invention is not limited
to the configurations previously described in the embodiments but
that various changes may be made to their designs.
For example, it is possible to properly change the design of the
specific shape of the disengaging pieces, the holding engaging
portions, or the like.
For example, the disengaging pieces have only to be able to
disengage the engaging pawls of the clip from the locking portions
of the backplane housing. The disengaging pieces are not limited to
the configuration having the abutting portion and engaging pawl
pushing portion provided at its leading end but may be variously
configured. The engaging pawls of the clip, which engage with the
corresponding locking portions of the backplane housing, may be
variously shaped. Correspondingly, the disengaging pieces may be
shaped to be able to disengage the engaging pawls of the clip from
the corresponding locking portions of the backplane housing. For
example, for a clip provided with a pair of elastic pawls engaging
with the backplane housing so as to grip it from both sides of it,
a configuration with a pair of disengaging pieces may be employed
which is configured to push open the elastic pawls outward.
Furthermore, possible specific configurations of the disengaging
pieces include:
(1) one in which by pushing in the clip removing tool toward the
backplane housing, the engaging pawls are first pushed in to reduce
the amount of part of each engaging pawl which projects from the
corresponding elastic pawl leading end portion, and then the
elastic pawls start to be pushed in to push the clip out to a
position at which the engaging pawls do not engage with the back
plane housing, while keeping the engaging pawls pushed in
(maintaining the reduced amount of projection) (the configuration
described in the above embodiment),
(2) one in which by pushing in the clip removing tool toward the
backplane housing, the engaging pawls are pushed in to reduce the
amount of projection from the elastic pawl leading ends, while the
elastic pawls are simultaneously pushed out, and
(3) one in which by pushing in the clip removing tool toward the
backplane housing, the elastic pawls first start to be pushed out
and the engaging claws then start to be pushed in so as to reduce
the amount of projection from the engaging pawl leading end
portions.
However, with a clip removing tool provided with holding engaging
portions, whether the disengaging pieces have the configuration
(1), (2), or (3), the holding engaging pieces engage with the
backplane housing or become able to engage with it before the
engaging pawls of the clip are disengaged from it.
The holding engaging portions are not limited to those which engage
with the backplane-side end surface of the internal housing as
illustrated in the above embodiment. The holding engaging portions
may be variously configured; they may engage with the interior of
the internal housing or the like or the its housing main body (the
sheath portion in which the internal housing is housed). For
example, for a backplane housing provided with a fitting groove
formed between an internal housing and a housing main body in which
the internal housing is housed so that a fitting pawl projecting
from a printed board housing can be inserted and fitted into the
fitting groove, it is possible to employ a configuration fitted
into the backplane housing as in the case with the printed board
housing, a configuration having a pawl inserted into and engaged
with the fitting groove, or the like.
Further, the pushing member 66 and spring 67 of the holding
engaging portion 60, shown in the above described embodiments, are
used to stably hold the backplane housing after the clip has been
removed. Accordingly, a configuration from which the pushing member
66 or the spring 67 is omitted is sufficient to draw out the
backplane housing disengaged from the clip, from the plug-in unit
together with the removing tool.
Furthermore, the scope of this clip removing tool is not limited to
optical connectors provided with the internal housing. The clip
removing tool is applicable to an optical connector without an
internal housing. Moreover, for example, even for a backplane
connector including a backplane housing provided with plural rows
of plug slots, the clip removing tool according to the present
invention is of course applicable to removal of a clip used to
attach the backplane connector to a backplane. In this case, the
size of the clip may be increased correspondingly to the backplane
housing of a size increased to deal with the large number of plug
slots. In such a case, a clip removing tool is applicable which is
provided with plural pairs of disengaging pieces. Then, the clip
can be efficiently removed because the plural pairs of disengaging
pieces simultaneously disengage the clip from the backplane housing
(specifically, its locking portions).
Furthermore, in the above described embodiments, the illustrated
clip removing tool is assembled by attaching the pawl block
provided with the disengaging pieces to the block-like removing
tool main body. However, the present invention is not limited to
this aspect. For example, it is possible to employ a configuration
in which the disengaging pieces are provided directly on one
predetermined removing tool main body. However, as illustrated in
the embodiments, if the removing tool main body is configured to be
replaceable, the separation between the disengaging pieces can be
easily set. Furthermore, it should be appreciated that this
configuration also allows the easy selection of a removing tool
main body provided with holding engaging portions compatible with
an optical connector such as a backplane housing which is attached
to the backplane.
The optical connector attached to the backplane is not limited to
the previously described backplane housing. For example, optical
connectors having various configurations based on a male and female
fitting structure can be employed, for example, optical connector
adapters themselves (shaped like an optical connector adapter for
an SC type optical connector specified in JIS C 5973 and an optical
connector adapter for an MPO type optical connector specified in
JIS C 5982). In this case, the shape of the clip varies depending
on the specific shape of the attached optical connector.
Correspondingly, the shape of the removing tool varies.
As described above, according to the clip removing tool according
to the present invention, the simple pushing operation on the
optical connector allow the engaging pawls of the elastic pawl
leading end portions of the clip to be easily disengaged from the
corresponding locking portions of the optical connector using the
disengaging pieces. That is, the disengaging pieces can be used to
easily disengage the clip from the optical connector by elastically
deforming the engaging pawls projecting from the side portions of
the corresponding elastic pawl leading end portions and engaging
with the optical connector. Furthermore, provided that for example,
the removing tool comprises, at its leading end, the engaging pawl
pushing portions that push the corresponding engaging pawls of the
clip to disengage the engaging pawls from the corresponding locking
portions of the optical connector, and the abutting portions that
push the corresponding engaging pawls, the clip removing operation
can be easily performed simply by pushing the removing tool.
Furthermore, if the removing tool main body is provided with the
attachment used to separately attach the operation handle for an
operation of advancement toward and retreat from the optical
connector, the removing tool can be efficiently pushed against an
optical connector installed in a plug-in unit or in other small
area by operating the operation handle attached to the removing
tool main body using the attachment. This allows the clip to be
removed more easily.
Furthermore, if the removing tool main body is provided with the
holding engaging portions that engage with the optical connector,
it is possible to prevent the optical connector from which the clip
has been removed, from falling from the backplane, by engaging the
holding engaging portions with the optical connector. This in turn
prevents inconveniences such as damage to the optical connector
resulting from the fall. Furthermore, by drawing out the removing
tool from the neighborhood of the backplane, the optical connected
can also be drawn out integrally with the removing tool. This is
very effective because the optical connector can be taken out more
easily from a small area such as the interior of the plug-in
unit.
Moreover, if the configuration is employed in which the clip is
disengaged from the optical connector held using a holding tool,
inconveniences can be prevented such as damage to the optical
connector resulting from its fall associated with its disengagement
from the clip. Furthermore, by drawing out the holding tool from
the neighborhood of the backplane, the optical connector can also
be drawn out integrally with the holding tool and can thus be taken
out easily from the neighborhood of the backplane. Thus, in
particular, the optical connector can be taken out more easily from
a small area such as the interior of the plug-in unit.
The term "clip" as used herein refers generally to members used to
attach the optical connector to the backplane. The clip is not
limited to the U-shaped member shown in the above-described
embodiment. That is, the above-described clip includes members of
various shapes used depending on the type of the optical
connectors, as described above, the ease with which the optical
connector is attached, the position at which the optical connector
is attached, or the like.
* * * * *